Abstract: To compose a composer… Soliloque sur [X, X, X et X] is not just a musical work, but more a meta-score, generated by the computer in real-time from other works of the concert. It means that for every concert, the generated work is different, in its sounds as well as in its organization. This computer application also requires a particular real-time technology, because it involves changing a signal processing network “on the fly” without sound interruption.